Association Analysis and Complementary Application of BTTC and EE AC Method for Rotor Angle Stability
郑超 1孙华东1
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作者信息
1. 中国电力科学研究院有限公司,北京市 海淀区 100192
折叠
摘要
大扰动冲击下,机群与网络受扰响应中均含有可表征功角稳定性的信息.该文首先针对两机系统,揭示了功角摇摆过程中不同空间位置的网络节点电压相位具有"分群归属"的差异特性,关键支路两端节点电压相位差与机群功角差则具有变化一致性;针对基于网络响应的支路暂态输电能力(branch transient transmission capability,BTTC)方法和基于机组响应的扩展等面积准则(extended equal area criterion,EEAC)方法,系统梳理了两种功角稳定降维评估方法的关联差异,以及两种方法在划分同调机群、确定临界指数上的技术互补性.面向跨大区单支路互联电网和局部多支路外送电网,仿真验证了 BTTC方法可为EEAC方法快速划分同调机群,EEAC方法则可为BTTC方法提供不稳定平衡点进而确定临界稳定指数.
Abstract
Under the impact of large disturbances,the rotor angle stability information is contained in the response of both the generator cluster and the network.In this paper,the voltage phase of the network nodes at different spatial positions during rotor angle swing has the characteristic of"group belonging"is revealed firstly,and the voltage phase difference between the nodes at both ends of the critical branch is consistent with the rotor angle difference of the generator cluster.For the branch transient transmission capability(BTTC)method based on the network response and the extended equal area criterion(EEAC)method based on the generators'response,the correlation and difference between the two methods of rotor angle stability evaluation and the technical complementarity of the two methods in dividing the group of coherent generator cluster and determining the critical index are systemically analyzed.The simulation results show that the BTTC method can be used for EEAC method to quickly partition the group of co-shunting generators,EEAC method can provide an unstable equilibrium point for BTTC method to determine the critical stability index.
关键词
功角稳定/支路暂态输电能力/扩展等面积准则/同调机群/临界稳定指数
Key words
rotor angle stability/branch transient transmission capability(BTTC)/extended equal area criterion(EEAC)/coherent generators/critical stability index
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